Lawn mower



June 9 1925.

D. G. GREGORIE LAWN MOWER IIE- l FIGA? fr Ven/fari li (l CII PatentedJune 9, 1925.

UNITED STATES kPartnr oFF1c.E.

DAVID GEORGE GREGOR-IE, OF PAHIATUA, NEW ZEALAND i n LAWN iao'vvnn.l

Appncanon inea February 14, 1920. sei-iai ne. 358,607.

nary type of lawn mower in which a station ary cutter bar works incombination with a rotating` cutter having lielically twisted bladesextending along its length and jen gaging with the surface of theknifeblade on the stationary cutter.

Hitherto considerable difficulty has been experienced in obtaining acorrect adjust-v ment of the stationary cutter in relation to therevolving cutter and also in obtaining a proper compensation for thevariable wear upon the knives of the rotating cutter and also for thewear on the stationary cuti ter knife.

The present invention has therefore. been Y devised with the object of.providing for the automatic adjustment of the stationary cutter inrelation to the rotating cutter so that as either, or both, wear, thewear will be compensated for and the stationary cutter kept in itsproper alignment and adjustnient for effective working con'ibinationwith the rotating cutter.

The invention consists broadly in so mounting the cutter carrying bar ofthe inachine that the cutting edge of the knife thereon may turn in orout in relation to the line of rotation of the rotating cutter, and inspring controlling the said bar in such a manner that the said edge willbe turned iiorinally'into contact with the blades of the rotating cutterwith a yielding spring pres# sure thereon, that will keep the two inproper cutting relation.

The said construction is illustrated in the accompanying drawings, inwhich Figure l is a sectional side elevation of a mower with therotating knives omitted but their position indicated bv dot-ted lines.

Figure 2 is a plan of the saine.

Figures 3 and 4 are respectively plan andk tween the side cheeks B ofthe machine, and

,having the knife blade C secured to its forward edge. This cutteroccupies the usual position Vin the machine relative to the rotating`cutter. Y The bar or frame A is niade at each end with a flange A thattitsagainst the inside of the correspondingside cheek B and is attachedthereto by a screw pin, or the like D, passing through it and into suchcheek. The two pins D are arranged Lopposite one another in a lineparallel with the axle of. the rotating cutter, and forni pivots uponwhich the frame or bar A inay turn up or do-wn so as to move the cuttingedge ofthe 4blade C in or out in relation to the line of rotation ofsuch rotating cutter. When `it is turned in, the said bladeassuines theproper relationship to the-rotating cut# ter to perform the usual mowingoperation.

This carrier frame or bar A is spring con-- vtrolled at eachend so as tokeepV the knife C in springy engagement with the rotating cutter, bymeans of al lever E pivoted at one of its ends tothe inside of the mowercheek B on the corresponding side and then extending rearwardly andengaging `at its other end beneath a snug or tooth F projectingforwardly from the carrier lug A. The said lever is suspended from a lugG on the cheek bymeaiis of a bolt H passing up through it and throughsuch lug and l forced normally upward by means of a cushion spring J incompression between the lug and a nut H on the end of the bolt.

lhe spring may therefore be adjustedein its tension by screwing the nutup or down on the bolt. rl`he saidv springs will therefore draw the twolevers E upward and thereby tipping the carrier frame A at the top backon its pins D and lifting the knife blade C forward and upward againstthe rotating cutter in the desired manner.

Consequently this adjustment and spring hinging of the carrier frame Awill ensure of any wear on the cutters being auton'iatin callycompensated for, the fixed cutter being at all times kept in propercutting contact with the rotating cutter.

At each end of the knife blade C, it is preferably provided with aprojection C (Figures 8 and '4) extending forwardly from the cuttingedge and having a curved upper face curving downward away from Contactwith the rotating cutter. These projections serve to engage cach knifeof the rotating cutter as it comes round in the maybe devised withoutdeparting. fromlthe general featuresof the means -shown and de'- scribedherein.- It 1s not'thereforedesired to conline the invention exclusivelyto the Vuse of such means.

I claim y i l. In lawn mowers having arotatin'g cutter, anda stationarycutter, a carrier frame for thestationary cutter, side cheeks on therespective sides of the ra1ne',a.l knife blade secured along the forwardedge ofi said carrier frame and ar/anged to extend across between thesidecheeksVa flange on each'end of the carrier fraine'- directlyengaging the inside of the corresponding side cheek, a pivot pinpassingl through the Harige and into the lsaidside-cheek, and leverarms, each pivotedf forwardly of' the carrier and at one end to theyside of onecheek` of' the machine andat its other end engaging with theorwardedge' of the saidcarrier frame on The usualv its respective side,and a spring acting-upon saidlever and normally turning it up upon itspivot, substantially as and for the purposes specified.

2. In lawn mowers having a rotating cutter, anda stationary cutter, acarrier frame for thestationary cutter, side cheeks on the respectivesides of the frame, a knife blade secured along the :forward edge ofAsaid` carrier' frame andi arr n-fO-ed to extend across between the sidecheeks, 'a iange on each end of the carrier frame directly! engaging,the'nside' or"y the cor-responding side cheek, a. pivot!y pinE passing:through@ the flange, and intoI the: said side-cheek;- and lever arms,eachgpivotecilr forwardly ofthe carrierand. at one end to the side ofone cheek of the machine' and, at its other end: engaging di` rectlywithA the forward edge of. the said carrier frame on its-respectivevside, and a spring actingj upon said lever` and normally turning it* up1 upon itspivotg, substantially as; andlfon the purposes specified.

In testimony whereof I, have signed this specification' in the presenceof two subscribingZ witnesses.

Devin? citons-n cnnconrn.

lVitnesses-z A; M; KENNEDY, F. LOGAN.'

